lihao/jemalloc
1
0
Fork 0
mirror of https://github.com/jemalloc/jemalloc.git synced 2026-07-23 13:13:06 +00:00
Code Issues Packages Projects Releases Wiki Activity

Add/use adaptive spinning.

Browse Source 
Add spin_t and spin_{init,adaptive}(), which provide a simple
abstraction for adaptive spinning.

Adaptively spin during busy waits in bootstrapping and rtree node
initialization.
This commit is contained in:
Jason Evans
2016-10-13 14:47:50 -07:00
parent a2539fab95
commit 9737685943
6 changed files with 66 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
src/rtree.c
View File

@@ -96,12 +96,15 @@ rtree_node_init(rtree_t *rtree, unsigned level, rtree_node_elm_t **elmp)
rtree_node_elm_t *node;
if (atomic_cas_p((void **)elmp, NULL, RTREE_NODE_INITIALIZING)) {
spin_t spinner;
/*
* Another thread is already in the process of initializing.
* Spin-wait until initialization is complete.
*/
spin_init(&spinner);
do {
CPU_SPINWAIT;
spin_adaptive(&spinner);
node = atomic_read_p((void **)elmp);
} while (node == RTREE_NODE_INITIALIZING);
} else {